[Tilesathome] Rendered tiles vanishing

[Jon Schlueter]

> I was restarting the MySQL server and doing some other stuff yesterday (and the day before). That might have caused some renderings to be dropped. Also the upload queue runner script was hanging and I restarted.
>
> I am sorry if that cause some tile renderings to have failed. I am currently working on the t at h box and trying to make things run smoother.

Thanks for working on it.  These messages are more diagnostic feedback
for you and others, to know how your efforts are going.  So far I've
seen mostly better responsiveness from the t at h system recently than
before.

Jon